El muchacho está enfermo, aunque no lo parezca.

English Original Sentence

The boy is sick, though he doesn’t appear so.

parezca→parece [?]

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English Translation

The boy is sick, though he doesn’t appear so.

after aunque an imperfecto form of verb is used (parezca)

But parezca is present subjunctive.

If I recall correctly, the rule is:

  • although / (even) though: aunque + indicative
  • even if: aunque + subjunctive
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Spelling: When a verb has an irregular stem in the first person singular in the Presente de Indicativo, we use this irregular stem to form the whole of the Presente de subjuntivo.
Subjuntivo: hypothetical or contrary-to-fact situation: the child is sick, but does not show it.

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